Problem #1: A composite wall is formed of a 2.5 cm Aluminum plate, a 6 mm layer of asbestos, and a 5 cm layer of fiberglass, and their thermal conductivities are 237 W/m·K, 0.2 W/m·K, and 0.04 W/m·K, respectively. The wall is subjected to an overall temperature difference of 32°C. Calculate the heat flow per unit area through the composite structure.